The utility model discloses a steel -pipe pile device with outer semi -girder, semi -girder outside steel -pipe pile body, tensioning device, hydraulic means, extrusion awl and a plurality of group, the top of steel -pipe pile body is connected with tensioning device's bottom, and tensioning device's top is connected with hydraulic means, the bottom of steel -pipe pile body is provided with the extrusion awl, and the extrusion awl is connected with tensioning device through wire rope, be provided with a plurality of groups through -hole on the lateral wall of steel -pipe pile body, the quantity of through -hole is the same with the quantity of outer semi -girder, and the size of through -hole is identical with the size of outer semi -girder, is provided with outer semi -girder in the through -hole, the utility model discloses hydraulic means passes through tensioning device promotion extrusion awl among the steel -pipe pile device with outer semi -girder for outer semi -girder extends outward to the stake, increased with the area of contact of the soil body, effectively improve the stability of pile body, and is showing the vertical bearing ability that improves the steel -pipe pile.